I'm assuming your car's stock? You don't have date of model so hopefully it's not a 2009 with a lot of miles on it, which could lead to seals hardening and vacuum leaks. Hopefully it's something minor. Searching for the vacuum leak as suggested is the first step.
Hauling *** then stopping abruptly and holding the brake pedal down the entire time the rotors are scalding hot can cause buildup on the rotors which can cause the grabby feeling you're having on braking.
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